Hello: at the cost of a small fortune, I've just successfully restored an OBX-A that was left for scrap. My repair (surprisingly) had a backup tape of the presets from another obxa that had come through his shop. Listening to the presents that loaded in and comparing them to the preset chart in the owner's manual shows that most of these are the factory presets (there may be a couple of the other owern's patches thrown in). Here's my issue. for patch A3 and the last two groups (CD and ACD) if I push the patch combinations, different lights light up, indicating to me that the patch is actually loaded and the synth has turned on the various parameters that make up that particular patch, e.g, saw versus other waves, unison or not, s/h or not, etc.--but NO SOUND comes out. What does this indicate There is something wrong with the memory patch of the synth for those patches Something else Thanks in advance for any suggestions.